Ubuntu – Manually Disable Wifi before suspend

i'm running Ubuntu 18.10 with Gnome – Suspend to Ram isn't working. my syslog told me that wpa_supllicant refuses to freeze. I already tried a couple fixes but none are working. Most of them are different variations of this. I Also tried using a different Firmware version as stated here. Although this is a bit over the top since wifi is working fine and my idea is to run a script ,when hitting the suspend button, that turns the wifi off, before the actual suspend action takes place.

Suspend to Ram is working if i disable wifi manually before suspending. Is there a way to automate it?

Wireless Chipset:

description: Wireless interface
       product: QCA6174 802.11ac Wireless Network Adapter
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: wlp4s0
       version: 20
       serial: c0:38:96:2f:a8:1f
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=ath10k_pci driverversion=4.18.0-13-generic firmware=SW_RM.1.1.1-00157-QCARMSWPZ-1

Update #1: as @GAD3R pointed out a Script in /lib/systemd/system-sleep will do the trick. However it doesn't seem to work. I created the Script

killwpa

in

/lib/systemd/system-sleep

and made it executable using

sudo chmod +x

I still cant suspend with Wifi on here's the output of my syslog:

Freezing user space processes ... 
Freezing of tasks failed after 20.002 seconds (9 tasks refusing to freeze, wq_busy=0):
wpa_supplicant  D    0  1013      1 0x00000004

Update 2: I modified the Script to unload the driver using modprobe and stopping the network manager – still freezing.

Script:

 #!/bin/bash
if [ "${1}" == "pre" ]; then

modprobe -rv ath10k_pci
systemctl stop NetworkManager.service 

elif [ "${1}" == "post" ]; then

modprobe -v  ath10k_pci
systemctl start NetworkManager.service

fi

syslog ouput:

Feb  1 09:13:25 aaron-GACK kernel: [ 1350.265251] Freezing user space processes ... 
Feb  1 09:13:25 aaron-GACK kernel: [ 1370.272019] Freezing of tasks failed after 20.006 seconds (3 tasks refusing to freeze, wq_busy=0):
Feb  1 09:13:25 aaron-GACK kernel: [ 1370.274617] wpa_supplicant  D    0  1036      1 0x00000004

Update 3:
I tried simplifying it and use a single script to unload the driver and kill wpa as recommended by GAD3R:

!/bin/bash
if [ "${1}" == "pre" ]; then
modprobe -rv ath10k_pci
/usr/bin/pkill wpa_supplicant
fi

Holy Moly – it worked! Back after suspending and Wifi is back on as well.

Update 4:
Nevermind. Tried Suspending again after the successful try…aaaand freeze again.
Syslog:

Feb  1 09:27:30 aaron-GACK kernel: [  421.558759] Freezing user space processes ... 
Feb  1 09:27:30 aaron-GACK kernel: [  441.561752] Freezing of tasks failed after 20.002 seconds (10 tasks refusing to freeze, wq_busy=0):
Feb  1 09:27:30 aaron-GACK kernel: [  441.564343] wpa_supplicant  D    0  1082      1 0x00000004